Text and Data Mining valid from 2018-04-17
Received: 17 November 2017
Accepted: 27 March 2018
First Online: 17 April 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The study was approved by the scientific ethics committee of the institute (Direzione Generale/Atti/2008/FF/R002/13.2.2008).
: All subjects gave their informed written consent.